Vacuum-bottle.



J. I. ENGEL.

VACUUM BOTTLE.

APPLICATION man 020.21. 1915.

Patented Oct. 3, 1916.

JOHN J. ENGEL, OF PITTSBURGH, PENNSYLVANIA.

VACUUM-BOTTLE.

Specification of Letters Patent.

Patented Oct. 3, 1916.

Application filed December 21, 1915. Serial No. 67,989.

To all whom it may concern Be it known that I, JOHN J. ENGEL, a citizenof the United States, residing at Pittsburgh, in the county ofAlleghenyand State of Pennsylvania, have invented certain new and usefulImprovements in Vacuum Bottles, of which the following is aspecification.

The invention relates to vacuum bottles, and has for its primaryobjects; the provision of an improved bottle, (1) which may cheaplyconstructed, (2) which is stronger than the one-piece bottle as here-'tofore made, (3) which requires nosupport for the inner shell asidefrom the support at the neck or top, and (4) which has a,

secure and enduring seal between the inner and outer shells. Certainembodiments of the invention are illustrated in the accompanyingdrawings, wherein Figure 1 is a vertical section through my improvedbottle, Figs. 2 and 3 are sections of the upper portion of the bottle intwo stages of the assembling operation, Figs. 4, 5 and 6 are partialsections illustrating modifications, and Fig. 7 is an enlarged sectionshowing a portion of the seal in the construction of Fig. 1.

In the construction of Fig. 1, the reference numeral 1 indicates theouter glass shell, 2 the inner glass shell, and 3 the glass cork fromwhich the air has been exhausted and which is provided with a coating 4of cork to insure a tight joint between thecork and the inner shell orcasing 2.

As indicated in Figs. 2 and 3, the upper portion of the outer shell 1 isprovided with a pair of inwardly projecting annular shelves 5 and 6,while the inner shell is provided with a pair of opposing shelves orshoulders 7 and 8, the purpose being to secure a tight joint between theinner and outer shells as hereinafter set forth.

Resilient seals in the form of rubber bands 9, 10-and 11 are employed,and after the air has been exhausted from the vacuum chamber containingthe shells and while the parts are in the position illustrated in Fig.2, the liquid or plastic cement 12 is applied. At this time the samevacuum exists between the two shells as that of the vacuum chamber, andthe inner shell is pressed down to the position indicated in Fig. 3 andmore liquid cement 13 is applied above the is continued until the innershell is forced down to its final position as indicated in Fig. 1. I

The joint between the two shells is thus provided with three rubberseals 9, 10 and 1 1, and two seals of cement 12 and 13, the,

cement being of such a character that it subsequently hardens, securelycementing the two shells together, and providing an air-tight seal.

The use of the cement is advantageous in that it not only adds to thesecurity of the seal but also serves to protect the rubber seals 10 and11 from the air. The resiliency of the rubber is thus retained for amuch greater period and a perfect seal is insured as long as suchresiliency endures. The rubber seals insure against a leakage of airwhile the cement seals are hardening, and gives a joint which is moreperfect than that which can be secured with a cement seal alone, sinceit has been found to be almost impossible to secure a lasting seal withceserve to protect the cement seals from the action of air and Water.

The band or seal 10 is preferably circular in cross-section as indicatedin Fig. 2, and when the inner shell is pressed into final position asindicated in Fig. 1, this band is deformed by the opposing shoulders 5and 7 to the cross-section shown in Fig. 1, thus giving a very perfectseal. An additional small shoulder 30 is also preferably employed belowthe shoulder 7 as shown best in Fig. 7,- such shoulder serving to pulldown a portion of the rubber below the shoulder 5. The pressure of theair upon the inner shell tends to hold such shellin the positionindicated in Fig. 1 during the period in which the cement is hardening,and the rubber seals as thus held under compression prevent any downflowof air or cement between the shells. The inner and outer shells can bethoroughly annealed before the assembling operation so that the bottleproduced is strong and serviceable. The support of the inne shell at itsupper end is such that noadditional supports are required between thetwo shells below their 55 seal 10, and the application of this cementupper ends and as a result the bottle is not single supporting shelf 16and one rub erv seal 17 above which the liquid or plasticcement 18 isapplied.

In the construction of Fig. 5 the inwardly projecting sup ort by theouter shell 19 is provided by t e inclined end portion 20 which opposesthe inclined portion 21 of the shell 22. Between these opposing portionsis provided the rubber seal 22' and the cement; seal 23.

Fig. 6 illustrates a modification of the structure of Fig. 5 in whichthe outer shell 24 is provided with a recess 25, and the inner shell 26is. provided with a recess 27. The rubber seal 28 fits in theserecesses, being deformed by the sharp corners thereof, and a cement seal29 is applied thereabove. Other modifications involving the sameprinciple of invention might obviously be made.

What I claim is:

1. In combination in a .vacuum bottle, an outer glass shell having aneck provided on its inner surface below the upper edge thereof with aninwardly projecting supporting portion, an inner glass shell having anopen neck provided on its outer surface below the upper end thereof witha projecting portion opposing and lying above the said supportingportion, and a resilient seal interposed between said opposing portions.7

2. In conibination in a vacuum bottle, an outer glass shell having aneck provided on its inner surface below the upper edge thereof with aninwardly projecting supporting portion, an inner glass shell having an on neck provided on its outer surface be ow the upper end thereof with aprojecting portion opposing and lying above the said supporting portion,a resilient seal interposed between said opposing portions, and a layerof cement between the two necks above the resilient seal forming apermanent seal and cementing the opposing surfaces of the neckstogether.

3. In combination in a vacuum bottle, an outer glass shell having a neckprovided on its inner surfacebelow the upper edge thereof with aninwardly projecting supporting portion, an inner lass shell having anopen neck provided on Its outer surface below the upper end thereof witha projecting portion opposing and lying above the said supportingportion, and a resilient seal interposed between said opposing portions,the inner shell being entirely supported at its neck.

4. In combination ma vacuum bottle, an outer glass shell open at itsupper end and having a supporting portion on the surface of such upperend, an inner glass shell in the outer shell open at its upper end andhaving a supported portion on its outer surface below such upper endopposing the said supporting portion, a resilient seal between thesupport ng and supported portions, a filling of cement above said sealand a second resilient seal between the two shells above the cement.

5. In combination in a vacuum bottle, an outer glass shell having aninwardly projecting annular shoulder at its upper end, an inner glassshell fitting in the outer shell and provided with an annular shoulderlying above, and opposing the first shoulder and also having anotherannular shoulder below both of the other shoulders, and a resilient sealcompressed between the two shells at the seal, such seal having itsupper edge opposite the upper shoulder on the inner shell and its' loweredge below the lower shoulder.

JOHN J. ENGEL.

